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# YOUNG MICRO SYSTEMS, INC.
CROSS 486G-VLB
Processor SL80486SX/80486SX/SL80486DX/80486DX/80486DX2/80486DX4/P24D/ Pentium
Overdrive
Processor 25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set OPTI
Max. 128MB
Onboard
DRAM
Cache 64/128/256/512KB
BIOS AMI
Dimensions 254mm x 218mm
I/O 32-bit VESA local bus slots (3), green PC
Options
NPU None
Options
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Turbo switch | J1 | Reset switch | J4 |
|---------------+----------+----------------------+----------|
| Power LED & | J2 | Turbo LED | J5 |
| keylock | | | |
|---------------+----------+----------------------+----------|
| Speaker | J3 | 32-bit VESA local | SL1 - |
| | | bus slots | SL3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | JP1 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| | Factory configured - do not | JP2 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Monitor type select color | JP3 | Closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | JP3 | Open |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP8 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP11 | Closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP12 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP13 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP14 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP15 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP16 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP17 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP18 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP20 | pins 2 & 3 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP21 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP22 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP25 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP28 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP30 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP31 | pins 2 & 3 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP38 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP39 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP40 | Closed |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 1MB | (1) 256K x | NONE | NONE | NONE |
| | 36 | | | |
|-------+-------------+------------+------------+------------|
| 4MB | (1) 512K x | (1) 512K x | NONE | NONE |
| | 36 | 36 | | |
|-------+-------------+------------+------------+------------|
| 4MB | (1) 1M x 36 | NONE | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 8MB | (1) 1M x 36 | (1) 1M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 8MB | (1) 2M x 36 | NONE | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 16MB | (1) 4M x 36 | NONE | NONE | NONE |
|-------+-------------+------------+------------+------------|
| 16MB | (1) 1M x 36 | (1) 1M x | (1) 1M x | (1) 1M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 32MB | (1) 4M x 36 | (1) 4M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 32MB | (1) 2M x 36 | (1) 2M x | (1) 2M x | (1) 2M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 8M x 36 | (1) 8M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 128MB | (1) 8M x 36 | (1) 8M x | (1) 8M x | (1) 8M x |
| | | 36 | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 512KB | (4) 128K x 8 | NONE | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP32 | JP33 | JP34 | JP35 | JP36 | JP37 |
|--------+--------+-------+-------+--------+--------+--------|
| 64KB | Open | 2 & 3 | 2 & 3 | Open | Open | Open |
|--------+--------+-------+-------+--------+--------+--------|
| 128KB | Open | 2 & 3 | 1 & 2 | Open | Closed | Open |
|--------+--------+-------+-------+--------+--------+--------|
| 256KB | Open | 2 & 3 | 2 & 3 | Closed | Closed | Open |
|--------+--------+-------+-------+--------+--------+--------|
| 512KB | Closed | Open | 1 & 2 | Closed | Closed | Closed |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP9 | JP10 | JP19 | JP29 | JP106 |JP107 |
|---------+-------+-------+------+------------+-------+------|
|SL80486SX|Closed |Closed | Open | 2 & 3 | Open | Open |
|---------+-------+-------+------+------------+-------+------|
| 80486SX |Closed |Closed | Open | 2 & 3 | Open | Open |
|---------+-------+-------+------+------------+-------+------|
|SL80486DX|Closed |Closed |1 & 2 |1 & 2, 3 & 4| Open | Open |
|---------+-------+-------+------+------------+-------+------|
| 80486DX |Closed |Closed |1 & 2 |1 & 2, 3 & 4| Open | Open |
|---------+-------+-------+------+------------+-------+------|
|80486DX2 |Closed |Closed |1 & 2 |1 & 2, 3 & 4| Open | Open |
|---------+-------+-------+------+------------+-------+------|
|80486DX4 | Open | Open |1 & 2 |1 & 2, 3 & 4|Closed |Closed|
|---------+-------+-------+------+------------+-------+------|
| P24D |Closed |Closed |1 & 2 |1 & 2, 3 & 4| Open | Open |
|---------+-------+-------+------+------------+-------+------|
| P24T | Open | Open |1 & 2 |1 & 2, 3 & 4|Closed |Closed|
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP5 | JP6 | JP7 |
|---------------+--------------+--------------+--------------|
| 25MHz | Open | Open | Closed |
|---------------+--------------+--------------+--------------|
| 33MHz | Closed | Open | Closed |
|---------------+--------------+--------------+--------------|
| 40MHz | Open | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 50iMHz | Open | Open | Closed |
|---------------+--------------+--------------+--------------|
| 50MHz | Closed | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 66iMHz | Closed | Open | Closed |
|---------------+--------------+--------------+--------------|
| 75iMHz | Open | Open | Closed |
|---------------+--------------+--------------+--------------|
| 100iMHz | Closed | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION (80486DX4 ONLY) |
|------------------------------------------------------------|
| Speed | JP26 |
|----------------------------+-------------------------------|
| 2x | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 2.5x | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 3x | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait states | JP23 |
|-------------------------------+----------------------------|
| 0 wait states | Open |
|-------------------------------+----------------------------|
| 1 wait state | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP24 |
|-------------------------------+----------------------------|
| <= 33MHz | Open |
|-------------------------------+----------------------------|
| > 33MHz | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS CONFIGURATION |
|------------------------------------------------------------|
| Setting | JP4 | JP27 |
|--------------------+-------------------+-------------------|
| CMOS memory normal | pins 2 & 3 closed | pins 1 & 2 closed |
| operation | | |
|--------------------+-------------------+-------------------|
| CMOS memory clear | pins 1 & 2 closed | pins 2 & 3 closed |
+------------------------------------------------------------+